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So recently I decided I wanted to play COD4 again, so I downloaded and installed from Steam. The single player runs fine, but the multiplayer errors out everytime: "iw3mp.exe has stopped working".

I've seen a few fixes for Vista around the net. Please do not respond with the "Stereo Mixer" fix, because there is no such thing in Windows 7.

What do I need to do to fix this error so I can play COD4 multiplayer again?

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up vote 1 down vote accepted

I have had a similar problem with Windows 7. It may be related to how Windows 7 uses Realtek sound card/mic input. This forum and this one seems to indicate that it might solve your problem.

NOTE: I have not yet been able to try this solution yet. Have given up on PC and am sticking with PS3!!

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You're correct. I ended up plugging in an old USB headset (because it has it's own sound drivers) just to boot the game, then I pull it out once it's booted. It works fine after that. –  blesh Feb 7 '11 at 14:23
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